I do indeed. my go-to lens is the 16-35mm f/2.8 L II, because it lets me get some of the landscape in as well. I do wish I had a wide angle prime in the 16 to 35 range that let me go wider than f/2.8, which is still a little slow for me sometimes.

My best current lens is the 14mm 2.8 L II. it is wide enough that at 30sec exposure the star trail is very small, and the 2.8mm is pretty fast. I've heard the 24mm 1.4 is the best of both worlds, as far as wide-angle and speed is concerned, and I have been drooling over it for a while now. My other thought is to get a star tracker and then combine a foreground shot with a star shot in post for the ultimate in low noise and sharpness.

My best current lens is the 14mm 2.8 L II. it is wide enough that at 30sec exposure the star trail is very small, and the 2.8mm is pretty fast. I've heard the 24mm 1.4 is the best of both worlds, as far as wide-angle and speed is concerned, and I have been drooling over it for a while now. My other thought is to get a star tracker and then combine a foreground shot with a star shot in post for the ultimate in low noise and sharpness.

I was hoping someone would reference that lens. I just rented it for three days, but unfortunately was unable to use it outdoors due to rain I could very well see why that would be an excellent lens for these types of shots, and yours are outstanding....I live in Raleigh, NC so I'd need to travel at least an hour or two to get away from all the light pollution. The 24mm 1.4 is pretty attractive, too...maybe even attractive enough to sell my 24-70mm and purchase this one since I haven't been doing many portraits this year. A "Star Tracker"? I've never heard of that. Is it software or a device?

I do indeed. my go-to lens is the 16-35mm f/2.8 L II, because it lets me get some of the landscape in as well. I do wish I had a wide angle prime in the 16 to 35 range that let me go wider than f/2.8, which is still a little slow for me sometimes.

Im torn on this as well...The 14mm, 24mm, or 16-35mm...all good lenses. It will be difficult choosing one.

I'm delighted to see this topic up here.I've been using on an APS-C Camera the Rokinon (Samyang) 8mm Fisheye F3.5.It was quite good.On the 5D Mark III I can tolerate higher ISO's so I've been using the 17-40mm F4.Maybe I should have gone for the 16-35mm 2.8 and the wider the better to reduce the time.I now have the Rokinon 14mm 2.8I hope I will get good shots from this and am waiting for the opportunity to try.Any tips on focusing to infinity - I can't see anything on the screen at 10X at these wide angles (except maybe the moon - which I would focus on if it's out).

A "Star Tracker"? I've never heard of that. Is it software or a device?

A device. You put it on top of a tripod, and it is kinda like a wedge whose angle must be set to an angle corresponding to your latitude. A motor on the wedge then drives the camera/telescope mounted to it at 1 rev per 24 hours, thereby "despinning" the Earth. Or to put it another way, it compensates for the rotation of the Earth when you take long exposures, so you don't get star trails. So you can expose for very long times.

A "Star Tracker"? I've never heard of that. Is it software or a device?

A device. You put it on top of a tripod, and it is kinda like a wedge whose angle must be set to an angle corresponding to your latitude. A motor on the wedge then drives the camera/telescope mounted to it at 1 rev per 24 hours, thereby "despinning" the Earth. Or to put it another way, it compensates for the rotation of the Earth when you take long exposures, so you don't get star trails. So you can expose for very long times.